Re: Why is that name not familiar ?
Agreed that size isn't important. Where Falcon 9 makes Electron look like a toy is in payload, ability to launch satellites beyond LEO and cost per kilo of payload. Rocket Labs is developing a Falcon 9 competitor called Neutron, but they don't expect it to launch until 2024. By which time SpaceX should have Starship working.
Falcon 9's size does give Rocket Labs a niche though. Even though SpaceX is much cheaper per kilo, if you need less than a couple of tons lifted, you have to wait until they aggregate a bunch of smaller satellites into what they call a rideshare package. Because SpaceX is concentrating on Starlink launches, those rideshare launches are few and far between, they only have two scheduled for this year. So if you have a small satellite and a need for certain orbits or launch times that cannot be served by a SpaceX rideshare, it may well be worth paying a premium to Rocket Labs.
BTW, Rocket Labs also received US government support. Almost half of their commercial launches have been wholly or partially dedicated to US government payloads.